Gfrp anchorage structure with enlarged head for controllable spacing and positioning of reinforcement bars

Abstract

A GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars is disclosed. The GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars according to the present invention comprises a GFRP enlarged head anchoring part that is coupled to a GFRP reinforcing bar and is configured such that the diameter gradually increases toward the end, a GFRP reinforcing bar adjacent to the GFRP reinforcing bar, and a fastening clip configured to enable spacing and position control between the reinforcing bar formed of steel adjacent to the GFRP reinforcing bar.

Description

Technology Field

[0001] The present invention relates to a GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars, and more specifically, to a GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars using a fastening clip and a spacing-maintaining fastening clip. Background Technology

[0002] Recently, in the field of structures where durability and long-term maintenance are important, GFRP (Glass Fiber Reinforced Polymer) reinforcing bars are attracting attention as a substitute for steel rebar. GFRP reinforcing bars offer excellent lightness relative to strength, are resistant to corrosion, and possess electrical insulation properties, expanding their applicability in various environments such as coastal areas, bridges, and tunnels.

[0003] One of the key factors in the structural application of such GFRP reinforcement is end anchorage. Generally, metal reinforcing bars can secure anchorage through mechanical post-processing or physical bonding; however, due to the material properties of GFRP reinforcement, mechanical forming is limited, so anchorage technologies have been developed to compensate for this. A representative method involves securing anchorage by forming an enlarged end anchorage by integrating concrete, cement paste, or resin material into the end of the reinforcement.

[0004] However, conventional enlarged head anchoring methods are generally designed with simple conical or spherical structures, making them vulnerable to structural deviations caused by load concentration or construction errors. In particular, when reinforcing complex structures where reinforcement bars must be arranged in various directions or cross-connected, it is difficult to accurately fix the positions or angles between the bars, which consequently limits the ability to consistently ensure designed performance.

[0005] Moreover, when reinforcing structures, not only is the anchoring of reinforcing bars required, but also the maintenance of spacing between reinforcing bars, precise placement of cross reinforcing bars, and ensuring construction consistency are complexly required, which affects both on-site construction convenience and structural reliability. Accordingly, there is a need to provide means to control the connection position, angle, and spacing with reinforcing bars.

[0006] Against this backdrop, there is a need for a technology that can stably and repeatedly implement a designed reinforcing structure by forming an enlarged head anchoring device having a stepped thickness structure at the end of a GFRP reinforcing bar and integrating a fastening clip capable of precisely binding reinforcing bars of various diameters and directions thereto. The problem to be solved

[0007] The present invention was devised to solve the problems of the aforementioned prior art, and aims to provide a GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars, which improves anchoring force to stably secure the pull-out resistance of GFRP reinforcing bars, allows for precise control of the position and spacing between reinforcing bars, and simultaneously increases work precision and efficiency at the construction site. means of solving the problem

[0008] A GFRP enlarged head anchoring structure capable of controlling the spacing and position of reinforcing bars according to the present invention for solving the aforementioned technical problem comprises: a GFRP enlarged head anchoring part that is coupled to a GFRP reinforcing bar and is configured to have a diameter that gradually increases toward the end; and a fastening clip configured to enable spacing and position control between a GFRP reinforcing bar adjacent to the GFRP reinforcing bar and a reinforcing bar formed of steel adjacent to the GFRP reinforcing bar.

[0009] The above enlargement head fixing part is characterized by having a plurality of unit enlargement heads, the cross-sections of which are arranged in a stepped manner and the diameter increases toward the ends.

[0010] The height difference between the unit enlargement head and the adjacent unit enlargement head is constant, but the height difference between the end enlargement head located at the shortest part of the enlargement head fixing section and the adjacent unit enlargement head is greater than the height difference between the unit enlargement head and the adjacent unit enlargement head.

[0011] The fastening clip is provided in a pair and is characterized by performing positional control or directional control between the GFRP reinforcing bar adjacent to the GFRP reinforcing bar and the reinforcing bar formed of steel adjacent to the GFRP reinforcing bar.

[0012] The above-described fastening clip is characterized by comprising: a first main body portion having a rectangular cross-section; a first reinforcing bar coupling portion having a shape that gradually narrows in width and becomes rounded as it extends upward from the first main body portion, to which a reinforcing bar formed of GFRP or steel is coupled; and a coupling hole formed at the center of the first main body portion for coupling with an adjacent fastening clip.

[0013] It is characterized by further including a connecting bar that simultaneously penetrates the connecting hole of a fastening clip and the connecting hole of an adjacent fastening clip.

[0014] The above-mentioned fastening clip is characterized by being coupled with the unit enlarged head of the enlarged head fixing part.

[0015] The fastening clip is provided in a pair and is characterized by being configured to enable spacing control and position control between the GFRP reinforcing bar adjacent to the GFRP reinforcing bar and the reinforcing bar formed of steel adjacent to the GFRP reinforcing bar.

[0016] The above-described fastening clip is characterized by comprising: a second main body portion having a rectangular cross-section; a second reinforcing bar coupling portion having a rounded shape that gradually narrows in width as it extends upward from the second main body portion, to which a reinforcing bar formed of GFRP or steel is coupled; and a coupling rod having a hollow column shape that is coupled vertically from the center of the second main body portion and has a GFRP reinforcing bar coupled inside.

[0017] It is characterized by the fact that the connecting rod of the fastening clip is connected to the other end of the GFRP reinforcing bar, which has one end connected to the connecting rod above, thereby enabling spacing control between the GFRP reinforcing bar and the adjacent GFRP reinforcing bar. Effects of the invention

[0018] According to the present invention, by integrally forming an anchoring device with a stepped structure in which the outer diameter is expanded at the end of a GFRP reinforcing bar, the pull-out resistance of the reinforcing bar can be effectively secured mechanically within a structure such as concrete. In particular, the stepped multi-stage structure alleviates stress concentration compared to a simple conical enlarged head and provides structural advantages that allow for more stable anchoring within the structure.

[0019] In addition, the anchoring device according to the present invention is combined with a fastening clip configured to allow reinforcing bars (GFRP or steel reinforcing bars) of various diameters and materials to be connected, thereby enabling the precise setting of the position and angle between the reinforcing bars according to design standards. The fastening clip includes a rounded reinforcing bar coupling groove, allowing reinforcing bars of various diameters to be coupled, and since rotation between adjacent fastening clips is possible through the coupling hole and coupling bar, multiple reinforcing bars can be cross-coupled at a predetermined angle.

[0020] In addition, the spacing clip maintains a constant spacing between a pair of GFRP reinforcing bars through a hollow connecting rod, preventing the reinforcing bars from detaching or bending and improving construction precision. This is effective in reducing interference between reinforcing bars during structural reinforcement, ensuring concrete cover thickness, and improving alignment. Brief explanation of the drawing

[0021] FIG. 1 is a conceptual diagram showing a GFRP enlargement head fixing device according to an embodiment of the present invention, FIGS. 2a and 2b are exemplary diagrams showing the application of a GFRP enlargement head fixing device according to an embodiment of the present invention. FIG. 3a is an exploded perspective view showing a fastening clip according to an embodiment of the present invention, FIG. 3b is a combined perspective view showing a fastening clip according to an embodiment of the present invention, FIGS. 4a and 4b are exemplary diagrams showing the combination of a fastening clip and a reinforcing bar according to an embodiment of the present invention. FIG. 5 is a perspective view showing a fastening clip for maintaining spacing according to an embodiment of the present invention, FIG. 6 is a perspective view showing the combination of a spacing fastening clip and a reinforcing bar according to an embodiment of the present invention. Specific details for implementing the invention

[0022] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0023] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0025] Hereinafter, a GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0026] FIG. 1 is a conceptual diagram showing a GFRP enlarged head anchoring part according to an embodiment of the present invention, FIG. 2a and FIG. 2b are exemplary diagrams showing the application of a GFRP enlarged head anchoring part according to an embodiment of the present invention, FIG. 3a is an exploded perspective view showing a fastening clip according to an embodiment of the present invention, FIG. 3b is an assembled perspective view showing a fastening clip according to an embodiment of the present invention, FIG. 4a and FIG. 4b are exemplary diagrams showing the combination of a fastening clip and a reinforcing bar according to an embodiment of the present invention, FIG. 5 is a perspective view showing a fastening clip for maintaining spacing according to an embodiment of the present invention, and FIG. 6 is a perspective view showing the combination of a fastening clip for maintaining spacing and a reinforcing bar according to an embodiment of the present invention.

[0027] Referring to FIGS. 1 to 2b, the GFRP enlarged head anchoring portion according to an embodiment of the present invention is formed integrally with the end of a GFRP reinforcing bar and performs the function of improving the pull-out resistance of the reinforcing bar inside a structure.

[0028] In particular, the GFRP enlargement head anchor is characterized by being formed as a multi-stage structure in which the outer diameter increases stepwise, rather than being a simple conical or spherical shape.

[0029] The GFRP expansion head anchorage is formed at the end of the GFRP reinforcing bar and consists of multiple expansion sections that form concentric circles with respect to the central axis of the reinforcing bar. That is, the GFRP expansion head anchorage has a stepped cross-section and has multiple unit expansion heads with increasing diameters towards the end.

[0030] Each unit enlargement head has a relatively short length and a cylindrical or tapered shape, and is formed so that the outer diameter gradually increases. As a result, a multi-stage stepped structure is formed in which the cross-section is formed like a step. This stepped cross-section provides a stress distribution effect at each stage when a load is applied, thereby distributing the stress acting on the anchorage more uniformly.

[0031] The enlarged head anchorage is formed from a hardenable material such as concrete, cementitious mortar, or synthetic resin. A helical groove or an uneven structure is formed on the outer surface of the GFRP reinforcing bar to induce the hardenable material to be strongly mechanically bonded with the reinforcing bar.

[0032] The enlarged head anchor according to the present invention has a stepped outer diameter structure that can resist pull-out forces stepwise within a concrete structure, thereby providing superior anchoring performance compared to conventional single curved anchors. In particular, stress is distributed due to the change in area at each unit enlarged head, and it has the effect of compensating for the toughness limit of GFRP reinforcing bars.

[0033] In addition, the enlarged head anchoring part according to the present invention is provided in a stepped shape, which is advantageous for coupling with a fastening clip, thereby enabling the securing of a precise fastening position when reinforcing a structure. Furthermore, since the enlarged head anchoring part is shipped from the factory in a pre-fabricated state, the specified anchoring force and fastening position can be secured at the site with only simple installation.

[0034] Referring to FIG. 1, the enlargement head fixing portion (110, 210, 310) may include a plurality of unit enlargement heads arranged in 3 to 5 stages and end enlargement heads arranged at the ends of the unit enlargement heads.

[0035] For example, in the case where it is provided in three stages, the enlarged head anchoring part (110) may include a first unit enlarged head (110a), a second unit enlarged head (110b), a third unit enlarged head (110c), and an end enlarged head (110d) that are combined with the GFRP reinforcing bar (50).

[0036] For example, in the case where it is arranged in three stages, the height difference between the unit enlargement head (110a) and the adjacent unit enlargement head (110b) and the height difference between the unit enlargement head (110b) and the adjacent unit enlargement head (110c) are constant, but the height difference between the end enlargement head (110d) located at the shortest end of the enlargement head anchoring section and the adjacent unit enlargement head (110c) is made larger than the height difference between the unit enlargement head (110a) and the adjacent unit enlargement head (110b) so that the anchoring effect can be maximized.

[0037] Referring to FIG. 2a, in state (a) of FIG. 2a, the GFRP reinforcing bar (50) is fixed within the structure by relying on adhesive or frictional force proportional to the cross-sectional size, whereas in state (b), a stepped enlarged head anchoring section (J1, J2, J3) with a gradually increasing outer diameter is formed to mechanically block the reinforcing bar from being pulled out of the structure. As a result, it is possible to secure high pull-out resistance while reducing the anchoring length.

[0038] In addition, in state (a) of Fig. 2a, stress may be concentrated at the end portion of the reinforcing bar, which may lead to structural instability; however, the stepped expansion structure in state (b) distributes stress in stages, thereby reducing the risk of fracture and improving long-term fatigue resistance. Furthermore, in state (b), the reinforcing bar and the enlarged head anchorage are materially or mechanically integrated, so the relative displacement between the reinforcing bar and the concrete structure is suppressed when a load is applied. As a result, crack suppression and the maximization of reinforcement effects are possible.

[0039] In addition, the reinforcement bar fastening position can be clearly set by means of a fastening clip at the enlarged head anchoring part (J1, J2, J3) in the state of (b) of FIG. 2a, thereby preventing the reinforcement bar from shaking or twisting during construction. This enables the reinforcement bar to maintain its accurate position even during concrete pouring and contributes to securing the cover thickness and design performance.

[0040] In the case of FIG. 2b, the enlarged head anchoring part (J) can have the same effect as FIG. 2a (b), and the enlarged head anchoring part (J) connected to both ends of the GFRP reinforcing bar (50) can double the structural safety in the critical section.

[0041] The fastening clip (400, 500) is provided to enable spacing and position control between the GFRP reinforcing bar adjacent to the GFRP reinforcing bar and the reinforcing bar formed of steel adjacent to the GFRP reinforcing bar. The fastening clip (400, 500) can be made of a non-metallic material such as resin or plastic.

[0042] Referring to FIG. 3a, the fastening clip (400) includes a first main body part (410) having a rectangular cross-section, a first reinforcing bar joining part (420) which is formed in a rounded shape and gradually narrows in width as it goes upward from the first main body part (410) to which a reinforcing bar formed of GFRP or steel is joined, a joining hole (430) formed at the center of the first main body part (410) for joining with an adjacent fastening clip, and may include a joining bar (440) that simultaneously penetrates the joining hole of the fastening clip and the joining hole of the adjacent fastening clip.

[0043] The first reinforcing bar connection part (420) and the second reinforcing bar connection part (520), which will be described later, are formed with a rounded tapered structure so that GFRP reinforcing bars or steel reinforcing bars of different diameters can be stably fixed. In particular, an internal slope is provided so that reinforcing bars of various shapes can be fitted into the reinforcing bar connection groove (460), so that it can be applied even to non-standardized reinforcing bars.

[0044] Referring to FIG. 3b, a pair of fastening clips (400) are shown joined together, and the pair of fastening clips can rotate around a connecting bar (440), so that the fastening clips are configured to enable positional or directional control between a GFRP reinforcing bar adjacent to a GFRP reinforcing bar and a reinforcing bar formed of steel adjacent to a GFRP reinforcing bar.

[0045] The first fastening clip (400) shown in FIGS. 3a and 3b can be connected to an adjacent fastening clip through the connecting hole (430) and the connecting bar (440), so it can be expanded into a grid-like structure that arranges several reinforcing bars at regular intervals.

[0046] Since it can rotate around the connecting bar (440), it forms a flexible construction structure that can adjust the intersection angle or relative position with the GFRP reinforcing bar according to site conditions.

[0047] As shown in FIG. 4a or 4b, a reinforcing bar or a reinforcing bar formed of steel or an enlarged head anchoring part (J) can be joined to a reinforcing bar joining groove (460), which is a part formed by reinforcing bar joining parts (420a, 420b), and can intersect at a predetermined angle.

[0048] The connecting hole (430) and the connecting bar (440) can be provided in an assembly-type structure, so that they can be disassembled and reassembled under certain conditions even after the reinforcing bar connection is completed following fastening at the site. This offers the advantage of allowing for flexible operations such as changing the location, replacing components, and maintenance during construction.

[0049] Also, referring to FIGS. 5 and 6, the fastening clip (500) is provided in a pair so as to enable spacing control and position control between the GFRP reinforcing bar adjacent to the GFRP reinforcing bar and the reinforcing bar formed of steel adjacent to the GFRP reinforcing bar.

[0050] The fastening clip (500) may include a second main body part (510) having a rectangular cross-section, a second reinforcing bar connecting part (520) having a shape that gradually narrows and becomes rounded as it extends upward from the second main body part (510) to which a reinforcing bar formed of GFRP or steel is connected, and a connecting rod (540) having a hollow column shape that is connected vertically from the center of the second main body part (510) and has a GFRP reinforcing bar connected inside.

[0051] Referring to FIG. 6, a pair of fastening clips (500a, 500b) are shown joined. By joining the other end of a GFRP reinforcing bar (50), which has one end joined to a connecting rod (540), the connecting rod (540) of the fastening clip is joined to the other end of the GFRP reinforcing bar, thereby enabling spacing control between the GFRP reinforcing bar and adjacent GFRP reinforcing bars.

[0052] The fastening clip (500) illustrated in FIGS. 5 and 6 includes a hollow connecting rod (540) to achieve precise spacing of spaced-apart GFRP reinforcing bars. In particular, the connecting rod (540) is formed to a specific length and can be cut and used on-site as needed or supplied in modular lengths, enabling construction automation or semi-automation according to the design spacing.

[0054] According to the present invention, by integrally forming an anchoring device with a stepped structure in which the outer diameter is expanded at the end of a GFRP reinforcing bar, the pull-out resistance of the reinforcing bar can be effectively secured mechanically within a structure such as concrete. In particular, the stepped multi-stage structure alleviates stress concentration compared to a simple conical enlarged head and provides structural advantages that allow for more stable anchoring within the structure.

[0055] In addition, the anchoring device according to the present invention is combined with a fastening clip configured to allow reinforcing bars (GFRP or steel reinforcing bars) of various diameters and materials to be connected, thereby enabling the precise setting of the position and angle between the reinforcing bars according to design standards. The fastening clip includes a rounded reinforcing bar coupling groove, allowing reinforcing bars of various diameters to be coupled, and since rotation between adjacent fastening clips is possible through the coupling hole and coupling bar, multiple reinforcing bars can be cross-coupled at a predetermined angle.

[0056] In addition, the spacing clip maintains a constant spacing between a pair of GFRP reinforcing bars through a hollow connecting rod, preventing the reinforcing bars from detaching or bending and improving construction precision. This is effective in reducing interference between reinforcing bars during structural reinforcement, ensuring concrete cover thickness, and improving alignment.

[0057] Furthermore, since the anchoring device and fastening clip structure of the present invention can be prefabricated and modularized, precise structural reinforcement construction can be performed on-site with only simple assembly, and the consistency of reinforcement quality and work efficiency can be significantly improved. In particular, by inducing the arrangement of reinforcing bars to be formed in three dimensions, various structural advantages such as multi-directional resistance to external loads, seismic reinforcement performance, and improved ductility of the structure can be secured simultaneously.

[0058] Therefore, the present invention provides the effect of improving constructability, anchorage, structural stability, and repeatability when reinforcing structures.

[0060] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0061] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0062] 50: GFRP reinforcement 110, 210, 310: GFRP enlargement head anchor 400: Fastening clip 410: First main body part 420: First reinforcing bar connection 430: Connection hole 440: Connecting bar 500: Fastening clip 510: Second main body part 520: Second reinforcing bar connection 540: Connecting rod

Claims

Claim 1 A GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position, comprising: a GFRP enlarged head anchoring part configured to be coupled with a GFRP reinforcing bar and having a diameter that gradually increases toward the end; and a fastening clip configured to enable spacing and position control between a GFRP reinforcing bar adjacent to the GFRP reinforcing bar and a reinforcing bar formed of steel adjacent to the GFRP reinforcing bar; wherein the enlarged head anchoring part has a plurality of unit enlarged heads with a stepped cross-section and a diameter that increases toward the end, and the height difference between the unit enlarged head and the adjacent unit enlarged head is constant, but the height difference between the end enlarged head located at the shortest end of the enlarged head anchoring part and the adjacent unit enlarged head is formed to be greater than the height difference between the unit enlarged head and the adjacent unit enlarged head to improve the anchoring effect, and the fastening clip is coupled with the unit enlarged head, and the fastening clip is configured as a pair to perform position control, direction control, or spacing control between a GFRP reinforcing bar adjacent to the GFRP reinforcing bar and a reinforcing bar formed of steel adjacent to the GFRP reinforcing bar. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position, characterized in that, in claim 1, the fastening clip comprises: a first main body portion having a rectangular cross-section; a first reinforcing bar coupling portion having a rounded shape that gradually narrows in width as it extends upward from the first main body portion, to which a reinforcing bar formed of GFRP or steel is coupled; and a coupling hole formed at the center of the first main body portion for coupling with an adjacent fastening clip. Claim 6 A GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position, characterized in that, in claim 5, it further includes a connecting bar that simultaneously penetrates the connecting hole of a fastening clip and the connecting hole of an adjacent fastening clip. Claim 7 delete Claim 8 delete Claim 9 A GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position, characterized in that, in claim 1, the fastening clip comprises: a second main body portion having a rectangular cross-section; a second reinforcing bar coupling portion having a rounded shape that gradually narrows in width as it extends upward from the second main body portion, to which a reinforcing bar formed of GFRP or steel is coupled; and a coupling rod having a hollow column shape that is coupled vertically from the center of the second main body portion and has a GFRP reinforcing bar coupled inside. Claim 10 A GFRP enlarged head anchoring structure capable of controlling reinforcing bar spacing and position, characterized in that, in claim 9, the connecting rod of a fastening clip is connected to the other end of a GFRP reinforcing bar, which has one end connected to the connecting rod, thereby enabling spacing control between the GFRP reinforcing bar and an adjacent GFRP reinforcing bar.

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